Manthey Racing releases 4.4 liter 997 GT3 engine with 530 horsepower

If you are not familiar with Manthey Racing or Manthey Motors here is some background information. Their Porsche motors have won the 24 Hours of Le Mans and the 24 Hour of the Nurburgring a combined 7 times. That is about as good as a resume for an engine builder is going to get and when it comes to Porsche GT3 engine building and racing Manthey is as elite as they come. Say hello to their new 4.4 liter motor available for 997 GT3 models equipped with the GT1 racing block.

Manthey can build a 4.4 liter with a 3.6 liter, 3.8, or even 4.0 base. It likely makes the most sense to start with a 3.6 liter motor as in the 997.1 GT3 model where the largest gains will be seen. The 3.6 starts out at 415 horsepower to gains of 115 at the crank are possible. Torque figures rise roughly 60 pound-feet. These numbers will obviously change when starting with a 3.8 or 4.0 engine base.

When racing in a naturally aspirated motor class every horse and pound-foot counts. For the serious road course junkies as well as those who just want more out of their 997 GT3 Manthey provides a tried and true tested 4.4 liter flat-6 solution. This is the best way to get significantly more power and torque out of the already high strung GT3 motor without seeking forced induction.

Replace one of the best engine built in the last 2 decades with some push rod engine..

Brilliant idea!

I take Olaf's engine in a 997GT3 any time of the day over any BMW with n/a engine.

Are YOU serious?
If you are going to add FI to a GT3, you might as well just buy a 911 Turbo.
I HATE rear engine and Porsche pricing, but even I respect the Turbo PDK.

You obviously know nothing about LSx engines that are far superior to the pathetic naturally aspirated engines from Porsche.
Replacing a Porsche N/A engine with a LS7 isn't brilliance, it's common sense.
Don't even get me started on what you can do with a custom built LSx engine.

Are YOU serious?
If you are going to add FI to a GT3, you might as well just buy a 911 Turbo.
I HATE rear engine and Porsche pricing, but even I respect the Turbo PDK.

You obviously know nothing about LSx engines that are far superior to the pathetic naturally aspirated engines from Porsche.
Replacing a Porsche N/A engine with a LS7 isn't brilliance, it's common sense.
Don't even get me started on what you can do with a custom built LSx engine.

The LS7 has about double the displacement, so strictly evaluating the motor it should be a lot more powerful. But the motors are for two completely different purposes -- Ones a bomb street motor, the other is racing motor that's been placed in a street car; just look at the redline differences.

If you take a GT3 and completely ruin it by putting in an LS motor, you should be dragged through hot coals & razor blades, pissed on, and then stoned to death. Save Porsche-LS swaps for Carreras.

Are YOU serious?
If you are going to add FI to a GT3, you might as well just buy a 911 Turbo.
I HATE rear engine and Porsche pricing, but even I respect the Turbo PDK.

You obviously know nothing about LSx engines that are far superior to the pathetic naturally aspirated engines from Porsche.
Replacing a Porsche N/A engine with a LS7 isn't brilliance, it's common sense.
Don't even get me started on what you can do with a custom built LSx engine.

Not everyone wants an LS in everything thanks so much.

This isn't a car designed for drag racing. This isn't a PDK turbo. This is a race car engine. Thanks so much.

Please correct me if I'm on wrong, but the LS7 initially had a HUGE issue with oil starvation in high speed left handers that was toasting motors at an alarming rate. Was this ever corrected? You could put the Metzger in a damn roller-coaster and run it at redline all day long with zero issues. It was designed for high G's, built on a race track and then moved to a street car. The LS7 is a great motor and can make huge power, but it was designed with much different initial goals and these shortcomings have shown up when the envelope is pushed.

Please correct me if I'm on wrong, but the LS7 initially had a HUGE issue with oil starvation in high speed left handers that was toasting motors at an alarming rate. Was this ever corrected? You could put the Metzger in a damn roller-coaster and run it at redline all day long with zero issues. It was designed for high G's, built on a race track and then moved to a street car. The LS7 is a great motor and can make huge power, but it was designed with much different initial goals and these shortcomings have shown up when the envelope is pushed.

Don't waste your time trying to make a logical argument with that guy. Here, let me respond for him since he can't:

"LOL you Euro douchebags don't know anything. I SPOKE WITH THE CORVETTE ENGINEERS. They told me while I was blowing them how great their motor is.

If only the Corvette had DCT and all wheel drive because anything without all wheel drive is for morons. YOU'RE ALL EURO DOUCHEBAGS LOL THE GT3 DOESN'T EVEN RUN 10's. Idiots."

Back to the subject at hand; Porsche was able to achieve 500hp out of 4.0l. I would think a 10% displacement increase would net at least 50hp. Was this all stroke and made up at the bottom end? I'd love to see dyno's of the two overlayed.